noun

• (military) Initialism of prisoner of war.
  "After his capture, he was taken to a camp for POWs."
• (religion) Initialism of place of worship.
• (cryptography, cryptocurrencies) Alternative letter-case form of PoW (“proof of work”).

noun

• (Scotland, Ireland, Northern England) Alternative form of poll.
  "he'd snuffle round the door till the few remaining hairs on the bald pow of Munro would fair rise on end."
• (skiing slang) Clipping of powder (“powder snow”).

noun

• (countable and uncountable, cryptography, cryptocurrencies) Initialism of proof of work.
  "With PoW, as new, unverified transactions become available or broadcast to the entire blockchain network, each node that maintains a copy of the ledger (also known as a “miner”) verifies a set of those transactions to prevent so called “double spending”."
• (countable) Alternative letter-case form of POW (“prisoner of war”).
  "The communists demand the release of all prisoners detained by Saigon – not only the so-called PoWs. This distinction between “prisoners” and “prisoners of war” is significant since the great majority of the NLF members held by Saigon do not have PoW status. Until 1965 there was no such thing as a PoW; NLF prisoners were considered common criminals."